File Splitter & Joiner

Break a big file into pieces that fit email or upload limits, then put them back together.

Runs in your browser. Nothing is uploaded Free, no sign-up Works on mobile

Choose a large file

or drag and drop here

Part size

Gmail attachments: 25 MB. WhatsApp documents: 2 GB.

How to use File Splitter & Joiner

Choose “Split”, pick the file and the part size.
Download all parts.
To rebuild, choose “Join parts”, select every part and download the joined file.

Will the joined file be identical?

Yes, byte for byte, as long as all parts are present and in order.

Can someone join the parts without this tool?

Yes, with a single command: copy /b on Windows or cat on Mac and Linux.

Are my files uploaded?

No. Files are read and processed by your browser on your own device, so there is no upload wait and no size limit set by a server.

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